@misc{indiciae683b5809e2c3,
  title = {A hard look at colonoscopy.},
  author = {J S Abrams},
  year = {1977},
  doi = {10.1016/0002-9610(77)90203-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/299991/},
  note = {Source identifier: 299991}
}